PDF-[BOOK]-The Story of Clocks and Calendars

Travel through time with the maestros as they explore the amazing history of timekeepingDid you know that there is more than one calendar While the most commonly used calendar was on the year 2000 the Jewish calendar said it was the year 5760 while the Muslim calendar said 1420 and the Chinese calendar said 4698 Why do these differences exist How did ancient civilizations keep track of time When and how were clocks first inventedFind answers to all these questions and more in this incredible trip through history. Basic FPGA Architecture. Xilinx Training. Objectives. After completing this module, you will be able to:. Describe the global and I/O clock networks in the Spartan-6 FPGA. Describe the clock buffers and their relationships to the I/O resources. Spring 2009. L. -9 . Logical Time. 1. Announcements. Project 1 update – Thursday. Due 2/26. HW 1 – due Thursday. 2. Last Lecture . –. Clock Sync Important Lessons. Clocks on different systems will always behave differently. While our dating system . may seem . obvious, it is not universal, and can even be considered controversial. There are many different dating systems still in use today, and even more that were previously used, which can confuse the matter of assigning dates to events. . A river flows at uniform speed . v. w. = 1.0 m/s between parallel shores a distance . D. = 120 m apart. A kayaker can paddle at 2.0 m/s relative to the water.. If the kayaker starts on one shore and always paddles perpendicular to the shoreline, how long does it take him to reach the opposite shore, and how far downstream is he swept?. General Relativity. Principle of equivalence:. There is no experiment that will discern the difference between the effect of gravity and the effect of acceleration.. Or…. Gravitational and inertial mass are equivalent.. A brief summary of the year 6 expectations in English. English. Spoken Language. Reading (Word-reading, comprehension). Writing (Transcription, Composition and ‘Spelling, Punctuation and Grammar’). Susmitha. . kota. . 21-sep-2015. AGENDA. Introduction. Synchronization. Physical Clocks. Global Positioning System. Algorithms. Future Work. References. Introduction: Real . Time System. EE324 Lecture 11. Assignment . Start early!. People who are doing well vs. Not doing well. . Last . Time–. RPC. Why remote procedure calls?. Simple way to pass control and data. Elegant transparent way to distribute application. Ken Birman. Cornell University. . CS5410 . Fall 2008. . Real time and clocks. Lamport showed that if we care about event ordering, the best option is to use logical clocks. But suppose we care about real time?. Art; Video Game. Setting: . . Calendars appear everywhere! Of course they predominantly come into play at the end and beginning of a calendar year (I even had to use the word calendar to define the time period I’m talking about…). I/O Devices - Keyboard. The number in the I/O register is the key number, called the scan code (not the ASCII code). . Keyboards have fewer than 128 key and only 7 bits are need to represent the key number . Time and Clock Time and Clock Primary standard of time = rotation of earth De facto primary standard = atomic clock (1 atomic second = 9,192,631,770 orbital transitions of Cesium 133 atom. Time and Clock Time and Clock Primary standard of time = rotation of earth De facto primary standard = atomic clock (1 atomic second = 9,192,631,770 orbital transitions of Cesium 133 atom. COS 418: Distributed Systems. Lecture . 4. Wyatt Lloyd. Today. Logical Time: Vector clocks. Distributed Global Snapshots. 2. Lamport. Clocks Review. Q: a .  b . . => . Q: . LC(a) < LC(b) => .